The firm hired by Elias, Fusion GPS, produced research that resulted a dossier detailing alleged connections between Trump and Russia. https://www.washingtonpost.com/politics/clinton-lawyer-kept-russian-dossier-project-closely-held/2017/10/27/e7935276-ba68-11e7-be94-fabb0f1e9ffb_story.html?noredirect=on&utm_term=.5d4c6f6e6aad